Changes in sleep/food

My baby generally eats every 3-4 hrs (6-7feeds a day) and eats 4oz. They generally sleep in 3 hr chunks after midnight then one hour chunks during the day between feedings. There is one time between like 10pm-midnight where they stay awake and wont sleep.

BUT the last three days baby has only fed 3x a day with spans of 6-8hrs between, but not all the time. And they have had 2-6 hr "naps". My boobs were not expecting this (breastfeeding mostly). Anyone else with a weird food/sleep shift at 13 weeks? My baby was a late term preemie so some of the developmental stuff is off. The wonder weeks app thinks I am 10 days from leap 3. But there is def something shifting and he has recently been entertaining himself on the playmat for an hour in the morning to boot (which is a good problem to have!)

Anyone else?